Magnetic properties of Dy nanoparticles and Al(2)O(3)-coated Dy nanocapsules

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	Magnetic properties of Dy nanoparticles and Al(2)O(3)-coated Dy nanocapsules
	X. G. Liu; S. W. Or; B. Li; Z. Q. Ou; L. Zhang; Q. Zhang; D. Y. Geng; F. Yang; D. Li; E. Bruck; Z. D. Zhang
	2011
发表期刊	Journal of Nanoparticle Research
ISSN	1388-0764
卷号	13 期号:3 页码:1163-1174
摘要	Dy(2)O(3)-coated Dy nanoparticles and Al(2)O(3)-coated Dy nanocapsules, with Dy cores with the average size of 3.6 and 17.6 nm, respectively, are synthesized by arc-discharge technique. The transition from ferromagnetism to antiferromagnetism absents in the Dy nanoparticles, due to that its average core size of 3.6 nm is smaller than the helix period of Dy. The temperature of the superparamagnetism-antiferromagnetism transition in the Dy nanocapsules increases abnormally to 105 K, while the N,el temperature decreases to 150 K. The magnetic-entropy change (-a dagger S (m)) of the Dy nanoparticles rapidly increases with decreasing temperature. For Al(2)O(3)-coated Dy nanocapsules, -a dagger S (m) reaches 15.2 J kg(-1) K(-1) at 7.5 K, due to the existence of superparamagnetism, and a peak (5.2 J kg(-1) K(-1)) appears at 105 K due to the superparamgantism-antiferromagnetism transition, and -a dagger S (m) exceeds 2 J kg(-1) K(-1) in the temperature range from 7.5 to 105 K, for a field change from 1 to 5 T.
部门归属	[liu, x. g.; li, b.; zhang, q.; geng, d. y.; yang, f.; li, d.; zhang, z. d.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [liu, x. g.; li, b.; zhang, q.; geng, d. y.; yang, f.; li, d.; zhang, z. d.] chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china. [liu, x. g.; or, s. w.] hong kong polytech univ, dept elect engn, kowloon, hong kong, peoples r china. [liu, x. g.; ou, z. q.; zhang, l.; bruck, e.] delft univ technol, fundamental aspects mat & energy grp, fac sci appl, nl-2629 jb delft, netherlands.;liu, xg (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china;liuxianguohugh@gmail.com
关键词	Nanoparticles Magnetic Properties Size Effect Rare-earth Metals Films Dysprosium Carbon Gd
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/30547
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. G. Liu,S. W. Or,B. Li,et al. Magnetic properties of Dy nanoparticles and Al(2)O(3)-coated Dy nanocapsules[J]. Journal of Nanoparticle Research,2011,13(3):1163-1174.
APA	X. G. Liu.,S. W. Or.,B. Li.,Z. Q. Ou.,L. Zhang.,...&Z. D. Zhang.(2011).Magnetic properties of Dy nanoparticles and Al(2)O(3)-coated Dy nanocapsules.Journal of Nanoparticle Research,13(3),1163-1174.
MLA	X. G. Liu,et al."Magnetic properties of Dy nanoparticles and Al(2)O(3)-coated Dy nanocapsules".Journal of Nanoparticle Research 13.3(2011):1163-1174.